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Summary: IQU: Practical Queue-Based User Association
Management for WLANs
Amit P. Jardosh, Kimaya Mittal, Krishna N. Ramachandran
Elizabeth M. Belding, and Kevin C. Almeroth
Dept. of Computer Science, University of California
Santa Barbara, CA, USA
{amitj,kimaya,krishna,ebelding,almeroth}@cs.ucsb.edu
ABSTRACT
Flash crowds and high concentrations of users in wireless LANs
(WLANs) cause significant interference problems and unsustain-
able load at access points. This leads to poor connectivity for users,
severe performance degradation, and possible WLAN collapse. To
validate this claim, we present two case studies of large, heavily
loaded operational WLANs. These studies provide significant in-
sight into the degraded performance and collapse of a WLAN dur-
ing heavy use. To address these problems, we propose IQU, a prac-
tical queue-based user association management system for heavily
loaded WLANs. IQU grants users fair opportunities to access the
WLAN while maintaining high overall throughput, even when the
WLAN is heavily loaded. The basic premise of IQU is to control
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